Jump to content

05 YZ250 with 09 YZ450f forks

Recommended Posts

I have an 05 Yz250 that I have recently upgraded to SSS forks from an 09 Yz450f.  I have been out riding a couple times with it still having the 450 springs and valving.  I now have a set of .44kg springs that I plan to put in and will have to do some revalving.  My original plan was to valve and spring them back to stock yz250 settings.  But it looks like I would have to order a handful of different shims to do that.  Or I could put the .44 springs in and start pulling out a few shims until I find a setting that might work.  I'm a newbie with valving so just looking to gather some more knowledge and hoping to start with a setting that isn't too terrible.   Below are the stock shim stacks that I found on the forum.  I realize gold valves would be an option too but I would rather not spend the money on them.  

Height- 6'4" / Weight- 175 lbs /  Age-30 / Class- C

 

Stock 09 YZ450f shims

32.11x18

30.11

28.11

26.11

24.11

22.11

20.11

18.15

17.25

20.11x4

17.11x3

11.25x2

17.3x3

float .2mm

 

Stock 08 Yz250 shims

BV

32-0.11*16

30-0.11*1

28-0.11*1

26-0.11*1

24-0.11*1

22-0.11*1

20-0.11*1

18-0.11*1

16-0.25*1

plate

11-0.25*5

14-0.11*1

16-0.11*1

18-0.11*1

20-0.11*1

22-0.11*2

mid

20-0.11*4

18-0.11*1

16-0.11*1

14-0.11*1

12-0.15*1

11-0.30*2

17-0.30*2

sc 5.3 mm

8-0.15*1

reb

20-0.11*3

13-0.11*1

18-0.11*1

16-0.11*1

14-0.11*1

12-0.11*1

10-0.25*1

spring 4.3 N

oil volume 330cc

com 8

reb 10

 

Share this post


Link to post
Share on other sites

0.44 will likely be a little soft in the front. I'm 180 and run 0.46.

I wouldn't spend the time and effort to swap back to the stock yz250 valving. With the 450 valving, you can likely tell what needs to be improved.

Get in touch with Dave J at Smart Performance Inc. He can put together a kit for the del taco mid valve kit and any other shims you might need along with instructions for tuning. The guy runs a top notch operation and at a great price point.

Share this post


Link to post
Share on other sites

Pull out 5 face shims on the base and see how it feels, 0.44 might be ok but might be too soft , you could try 0.44 on std valving

Share this post


Link to post
Share on other sites

Woods or mx? Woods I think that spring rate will be good and if you want really plush forks and since you're a C Rider take out 8 of the 32mm base valve face shims, and 2 of the 20mm and 1 17mm mid valve shims. You can always revalve again if it's too soft or too stiff for your liking. If mx I'd still take out a bunch just not as many 

Share this post


Link to post
Share on other sites

I ride mostly mx with some woods as well.  Just for fun, don't do any racing.  

I used the race tech spring calculator which led me to to get the .44 kg(stock yz250).  The stock 450 springs in there now are .47kg.  I figure if it did end up being to soft I could use one of each spring rate?  Which would put me at .455kg.  If I am going to a lighter spring how much should I do with the rebound valving? Just open up the clickers to start with or remove one of the 20.11?

Share this post


Link to post
Share on other sites

Yes, that's what I did on my 125, used 1 softer spring and 1 stock to get me closer to the right spring rate and it works good. Ya I would try opening up the rebound clickers a couple clicks if needed and try tuning with clickers.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:


×